Simulation study of the recompression of metal spallation zone

LIU Jun; SUN Zhiyuan; ZHANG Fengguo; WANG Pei

doi:10.11883/bzycj-2021-0262

Volume 42 Issue 3

Apr. 2022

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LIU Jun, SUN Zhiyuan, ZHANG Fengguo, WANG Pei. Simulation study of the recompression of metal spallation zone[J]. Explosion And Shock Waves, 2022, 42(3): 033101. doi: 10.11883/bzycj-2021-0262

Citation:

LIU Jun, SUN Zhiyuan, ZHANG Fengguo, WANG Pei. Simulation study of the recompression of metal spallation zone[J]. Explosion And Shock Waves, 2022, 42(3): 033101. doi: 10.11883/bzycj-2021-0262

LIU Jun, SUN Zhiyuan, ZHANG Fengguo, WANG Pei. Simulation study of the recompression of metal spallation zone[J]. Explosion And Shock Waves, 2022, 42(3): 033101. doi: 10.11883/bzycj-2021-0262

Citation:

LIU Jun, SUN Zhiyuan, ZHANG Fengguo, WANG Pei. Simulation study of the recompression of metal spallation zone[J]. Explosion And Shock Waves, 2022, 42(3): 033101. doi: 10.11883/bzycj-2021-0262

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Simulation study of the recompression of metal spallation zone

doi: 10.11883/bzycj-2021-0262

1.
Institute of Applied Physics and Computational Mathematics, Beijing 100094, China
2.
Center for Applied Physics and Technology, Peking University, Beijing 100871, China

Received Date: 2021-06-28
Rev Recd Date: 2021-10-28

Available Online: 2021-12-29

Publish Date: 2022-04-07

Abstract

Abstract

Metal spallation phenomenon often occurs when shock waves are reflected and unloaded on a free surface. If there is a secondary shock wave impact, the metal spallation zone will be compressed again, and the metal in the tensile state will be gradually recompressed into a dense material until the spallation zone disappears. The above process is referred to as the recompression process of the metal spallation zone. The main difficulty of the recompression process simulation is that the initial tensile state of the spallation zone is hard to be determined, and it is difficult to accurately measure the recompaction state experimentally. These bring great difficulties in verifying the reliability of macro-simulations under complex loading. In this case, direct numerical simulations with the ability to describe the internal details of the spallation zone become an effective means to verify the reliability of the macro-simulation. Firstly, in direct simulation modeling, the initial tensile state of the metal spallation zone is set to three situations: containing only spalls, only holes, and both holes and spalls. After that, through direct numerical simulations of different porosity, recompression rate, number of spalls and number of holes, the recompression states of the metal spallation zone under the corresponding working conditions are statistically obtained. Finally, under the condition that the constitutive model and parameters of the direct simulation and macro-simulation have good comparability, macro-modeling and simulation analysis of the spallation recompression process are carried out. The results show that: if there are spalls in the spallation zone, the macro-simulation can better simulate the recompression process and the state of the metal spallation zone when the mesh fracture post-processing algorithm is "set stress to zero and keep temperature constant". If the initial state of the recompression process contains only holes, then macro-simulations cannot well simulate the recompression process and the recompression state no matter whether the hole collapse forms surface material ejections or not.
- spall,
- recompression,
- direct simulation,
- macro-simulation,
- interface ejection

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References(27)

References

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